ditopic adamantane guest dimers, C2 and C3, have flexible methylene spacers. The ROESY spectra of the β-cyclodextrin dimer with the ditopic adamantane guest dimers showed NOE between the protons of adamantyl substituents and the inner protons of cyclodextrin. The ditopic adamantane guest dimers, C2 and C3 formed cyclic supramolecular oligomers in aqueous solutions. The cyclicstructure was observed by atomic
Novel supramolecular polymers have been prepared from a β-cyclodextrin dimer and ditopicguest dimers having adamantyl groups. A guest dimer (CO) with a 4,4'-bipyridinium group as a stiff spacer between adamantyl groups gave linear supramolecular polymers with high molecular weight, although guest dimer (C2) with flexible methylene spacers gave cyclic supramolecular polymers in aqueous solutions.
Synthesis and binding properties of cyclodextrin trimers
作者:David K Leung、Joshua H Atkins、Ronald Breslow
DOI:10.1016/s0040-4039(01)01200-x
日期:2001.9
A series of cyclodextrin trimers and dimers were prepared and examined as binders for appropriate trimeric and dimeric aminoacid amides. Tritopic binding was stronger than ditopic binding, although the free energies were not strictly additive. Such trimers are attractive prospects for the binding of polypeptides and proteins.